Are these two subjects related? Well, it all depends. If you are in 八大行業 or showbiz, I would say maybe but it is only a plus. My bottom line is that the 事業線 has nothing to do with a woman's career, period. At least, I won't judge the capacity of her brain when I see a woman showing her 事業線. It is called Cleavage in English and 乳溝 in Chinese.
I have no problem with women who are willing to show thier cleavage as long as it is in an appropriate environment. You don't show half of your tits in the office or when you visit your male OB/GYN. My conclusion is this is a win win situation for both man and women becasue 男人愛看 and 女人愛露. I figure if a women is willing to spend $4000 to get a boob job, she definitely wants other people to know her cup size increases NATURALLY. (the keyword is naturally)
事業線 must be invented by a chauvinist pig in Taiwan.